/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Original Files: apache/flink(https://github.com/apache/flink)
 * Copyright: Copyright 2014-2022 The Apache Software Foundation
 * SPDX-License-Identifier: Apache License 2.0
 *
 * This file may have been modified by ByteDance Ltd. and/or its affiliates.
 */

package com.bytedance.bitsail.flink.core.typeutils.base;

import com.bytedance.bitsail.common.column.Column;

import org.apache.flink.api.common.typeutils.TypeComparator;
import org.apache.flink.core.memory.DataInputView;
import org.apache.flink.core.memory.DataOutputView;

import java.io.IOException;

/**
 * @desc:
 */
public abstract class ColumnTypeComparator<T extends Column> extends TypeComparator<T> implements java.io.Serializable {

  private static final long serialVersionUID = 1L;
  protected final boolean ascendingComparison;
  // For use by getComparators
  @SuppressWarnings("rawtypes")
  private final TypeComparator[] comparators = new TypeComparator[] {this};
  private transient T reference;

  protected ColumnTypeComparator(boolean ascending) {
    this.ascendingComparison = ascending;
  }

  @Override
  public int hash(T value) {
    return value.hashCode();
  }

  @Override
  public void setReference(T toCompare) {
    this.reference = toCompare;
  }

  @Override
  public boolean equalToReference(T candidate) {
    return candidate.equals(reference);
  }

  @Override
  public int compareToReference(TypeComparator<T> referencedComparator) {
    int comp = ((ColumnTypeComparator<T>) referencedComparator).reference.compareTo(reference);
    return ascendingComparison ? comp : -comp;
  }

  @Override
  public int compare(T first, T second) {
    int cmp = first.compareTo(second);
    return ascendingComparison ? cmp : -cmp;
  }

  @Override
  public boolean invertNormalizedKey() {
    return !ascendingComparison;
  }

  @Override
  public boolean supportsSerializationWithKeyNormalization() {
    return false;
  }

  @Override
  public void writeWithKeyNormalization(T record, DataOutputView target) throws IOException {
    throw new UnsupportedOperationException();
  }

  @Override
  public int extractKeys(Object record, Object[] target, int index) {
    target[index] = record;
    return 1;
  }

  @SuppressWarnings("rawtypes")
  @Override
  public TypeComparator[] getFlatComparators() {
    return comparators;
  }

  @Override
  public T readWithKeyDenormalization(T reuse, DataInputView source) throws IOException {
    throw new UnsupportedOperationException();
  }
}
